What was found
UPON APPROACH DURING GEAR EXTENSION, CREW NOTED LEFT MAIN GEAR UNSAFE INDICATION. RECYCLED LANDING GEAR, NO HELP. ON THIRD ATTEMPT, DURING TOWER FLY-BY, LEFT GEAR EXTENDED AND LOCK INTO POSITION. AIRCRAFT LANDED WITHOUT INCIDENT. MX FERRIED AIRCRAFT GEAR DOWN TO DAL. REPLACED LEFT MAIN GEAR UPLOCK ACTUATOR PER BOEING M/M.